Optical response of a nematic liquid crystal cell at splay-bend transition: model and dynamic simulation

摘要

We study dynamical optical response of a nematic liquid crystal cell thatundergoes the splay-bend transition after applying the voltage across the cell.We formulate a simplified model that takes into account both the flexoelectriccoupling and the surface rotational viscosity. The dynamic equations of themodel were solved numerically to calculate temporal evolution of the directorprofile and the transmittance. We evaluate the response time as a function of anumber of parameters characterising dielectric and elastic anisotropies,asymmetry of the surface pretilt angles, anchoring energy, surface rotationalviscosity and flexoelectricity.